June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Introducing device trees
If you are working with ARM or PowerPC SoCs, you are almost certainly going to encounter device trees at some point. This section aims to give you a quick overview of what they are and how they work, but there are many details that are not discussed.
A device tree is a flexible way to define the hardware components of a computer system. Usually, the device tree is loaded by the bootloader and passed to the kernel, although it is possible to bundle the device tree with the kernel image itself to cater for bootloaders that are not capable of loading them separately.
The format is derived from a Sun Microsystems bootloader known as OpenBoot, which was formalized as the Open Firmware specification, which is IEEE standard ...
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